Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc51c83891d1ace6…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 14:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 960f540ced9a41c883921c6e36b7288b SHA-1: c4eb643647534de93c3227e4dfaf252e3cb7bba7 SHA-256: bc51c83891d1ace66310a2f5c7ee558f8539052e31838a63a21dc3bbc3388039
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and are structured as link farms. These elements suggest the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=how+to+view+a+private+accounts+followers
    • https://affordans.com/ckfinder/userfiles/files/jumosibafukajisow.pdf
    • http://libron.pl/fckupload/assets/file/lakonofi.pdf
    • https://economiadecomunion.com/ckfinder/userfiles/files/fesijaxirimiririf.pdf
    • http://changrung.com/ckfinder/userfiles/files/rojetid.pdf
    • http://german-ex.com/images/blog/file/razazajuzixatujawa.pdf
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/vujujomizunuxevikidometop.pdf
    • http://progettogeometra.it/userfiles/files/wafobabopas.pdf
    • http://farmandari-sarvestan.ir/images/news/files/jupefudilavaroxone.pdf
    • https://cancelaria.pl/galeria/file/45093968826.pdf
    • http://musicandyouapp.com/webupload/editorimg/files/10520412438.pdf
    • http://cnpair.com/userfiles/file/gugalusovexojopu.pdf
    • http://moyamoya.center/images/hand_uploaded/files/dogigabamugapojusat.pdf
    • http://sissonne.hu/editor_up/69010930593.pdf
    • http://dragoniresorts.com/userfiles/pudulowewinuk.pdf
    • http://marupi.de/UserFiles/File/darefakagoduvop.pdf
    • http://partnerplus30.ru/images/fornews/files/jinaz.pdf
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/zajomesujejekuvajaruniz.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e6de19e205903031552d9693fd881329/kafubuwusexedotuvutizitax.pdf
    • http://hdurmuslar.com/images_upload/files/jebopokipadoboregi.pdf
    • http://chiangmai-esc.net/user_img/files/fobexuruxepidobedozoko.pdf
    • https://viettrungson.com/media/Files/86950353578.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/temugepiven.pdf
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210905162044.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0ffs1c26s9mbfftmrfhao08klj/lawujifipiberutiwe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 16792 bytes
font_01_sfnt_off0000f394.bin
fbfcfdf3a04c07e47fb0934eebf6f5887db2c17d4b3c1ecd877c4d04e1aeb2b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 17848 bytes
font_02_sfnt_off000121b9.bin
d6849a9e05ebf1150496d2e625632ef5eaad2e0b9a03a7db2318ee66781e6229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B9 10716 bytes

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